Bachelor with “demons” (Sleezy) [sic] (2015) by Elijah Burgher. One of a new series of artworks by Burgher showing at Zieher Smith & Horton, NYC.

• The week in HR Giger: Belinda Sallin on her documentary, Dark Star: HR Giger’s World; Ron Kretsch on the unseen cinema of HR Giger; Matthew Cheney thinks the Gigeresque has become too familiar. I can see his point but originality is always in short supply; asking for something new means setting yourself up for a long wait.

• Pwdre ser, or Star jelly, is “a pale, foul-smelling jelly traditionally associated with meteorite falls”. The Rot of the Stars at the ICA, London, is an audio-visual art collaboration between Jo Fisher and Mark Pilkington dealing with the mysterious substance.

To assume that a given group of people would be similar because of birthdate, Ryder thought, was to risk committing a fallacy. “The burden of proof is on those who insist that the cohort acquires the organised characteristics of some kind of temporal community,” he wrote. “This may be a fruitful hypothesis in the study of small groups of coevals in artistic or political movements but it scarcely applies to more than a small minority of the cohort in a mass society.”

Generational thinking is a bogus way to understand the world says Rebecca Onion